Function translateAstToFreefind

translateAstToFreefind(ast: SearchAst): string

Translates a SearchAst into FreeFind's refined-search syntax (the engine LiMac delegates to). Phrases are parenthesized so multi-word terms stay grouped, and boolean nodes use FreeFind's AND/OR/NOT keywords.

Parameters

ast: SearchAst
The parsed query tree.

Returns string

A FreeFind query string.

Example

translateAstToFreefind({ type: "or",
  left: { type: "term", value: "sulfuric acid", phrase: true },
  right: { type: "term", value: "boric acid", phrase: true } });
// "(sulfuric acid) OR (boric acid)"

Source

export function translateAstToFreefind(ast: SearchAst): string {
  switch (ast.type) {
    case 'term':
      return `(${ast.value})`;
    case 'and':
      return `${translateAstToFreefind(ast.left)} AND ${translateAstToFreefind(ast.right)}`;
    case 'or':
      return `${translateAstToFreefind(ast.left)} OR ${translateAstToFreefind(ast.right)}`;
    case 'not':
      return `NOT ${translateAstToFreefind(ast.operand)}`;
  }
}